When using Linux double tap doesn’t work to center a unit group. Alt tabbing sometimes fixes it. Some say num lock sometimes fixes it.
Proton experimental
Also reported on lutris(Reddit post)
well seeing as sc2 was never meant for linux reporting problems that happen in linux are pointless
It’s kind of Windows. Proton is translating it.
It’s growing in popularity so hope it will get some attention. This is the only issue I’ve found playing on proton. Runs really smooth
again, sc2 was not made for linux, ever, so if you are having problems in linux, thats on you and linux. sc2 has nothing to do with it
Lots of devs are optimizing for proton even tho it’s not officially supported. I think it’s important to remove any annoying bugs so we avoid loosing players using the steam machine f.ex.
bud, what dont you get about sc2 not made for linux. you use linux at your own risk, period
Of course i understand that.
Have a lovely weekend
I’m on Linux Ubuntu and I’m using steam proton 10.0-4
No real bugs on my end maybe stop using the experimental version
Windowed Full-screen is also better if you’re addicted to tabbing out. 
Maybe you have Bounce Keys enabled which ignores repeated duplicate key presses.
Anyways hope you can figure it out, Worst case scenario try reinstalling Battlenet/Sc2.